真题考研

CONCEPTION and cancer, which mark the beginning and, often, the end of life, share some molecular details. Cancer cells copy their contents and divide rapidly; so do newly fertilized eggs. This requir...

A meaty questionIF YOU have ever longed for a meat substitute that smelt and tasted like the real thing, but did not involve killing an animal, then your order could be ready soon. Researchers believe...

Aircraft emissions: The dirty skyAll big ideas start life on the fringes of debate. Very often it takes a shocking event to move them into the mainstream. Until last year interest in climate change wa...

Behind the bleeding edgeMANKIND'S progress in developing new gizmos is often referred to as the "march of technology". That conjures up images of constant and relentless forward movement orc...

Britain almost more than any other country in the world must seriously face the problem of building upwards, that is to say, of accommodating a considerable proportion of its population in high blocks...

Where do pesticides (杀虫剂) fit into the picture of environmental disease? We have seen that they now pollute soil, water and food, that they have the power to make our streams fishless and our ga...

Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The atmosphere again acts as our protective blanket on earth. Light gets through...

Taste is such a subjective matter that we don’t usually conduct preference tests for food. The most you can say about anyone’s preference, is that it’s one person’s opinion. Bu...

The speaker, a teacher from a community college, addressed a sympathetic audience. Heads nodded in agreement when he said, High school English teachers are not doing their jobs.” He described th...

Exchange a glance with someone, then look away. Do you realize that you have made a statement? Hold the glance for a second longer, and you have made a different statement. Hold it for 3 seconds, and ...